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Question

How far is the moon in light-years from earth?


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Solution

Step 1: Given

Light Years

  1. A light-year is a unit used to measure astronomical distance.
  2. One light-year is defined as the total distance traveled by light in one year.
  3. One light-year is equal to 9.461×1015m

Step 2: Distance between moon and earth

  1. The average distance between the Earth and the Moon is 384400km.
  2. Light travels at 300,000 kilometers per second.
  3. Then the time is taken to cover the distance between the Earth and the Moon will be.
  4. t=384400300000=1.3sec
  5. This is the time taken by light to travel the distance between the Earth and the Moon.

Hence the distance between the Earth and the Moon is 1.3 light-second.


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